Carburetor heater



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4lumuneton HEATER. APPLICATION FILED FEB. 1.9. 1921.

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Patented Fb. 21,1922,

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l To all'whovn it may concern a Be it known that we, Animar G. Koen and LoUxs'C. F www, citizens ofthe United States, residing at Appleton, county ot Outxig'amie, and State of Wisconsin, have invented new and useful Improvements in Carburetor Heaters, of which the following is a specification. .Y

This invention relates to heaters for carburetors designed to aid in the starting and running of a hydrocarbon motor.

Objectsof this invention are to provide a' "demands, as for exam le, to allow a relativlylarge amount o heat to be delivered prior' to, or at, startin and a relatively smaller amou t tobe de ivered under other conditions; a'ii` o provide such a carburetor heater so arranged that all of the heat in the different adjustments is effective.

4Further objects are'to provide a carburetor heater. in which provision is made for j absorbing the moisture due to the sweating oflthe -carburetor; to provide a heater in which radiation is very small; and to provide a heater of simple and sturdy construc-l tion which may be. cheaply and lreadily y manufactured.

bis,

An embodiment ofthe invention is sh'own in the accempan ingdrawings, in which:

Fig.. 1 is a iagrainmatic view of the heater andV circuits and shows a carburetor float chamber in section.

;Fi 2 is an elevation of the carburetor p art y in section showing the heater in position.

Fig. 3 is a diagrammatic view showin the circuits and the heating element remove and in extended position. a.

Fig; 4 is a section .on the 'line 4-4 of F ig. 1.

peoloation o flLett-ers Patent.

Fig. 5 is a section on the line 5--5 of Fig.

1 illustrating in detail the construction of one of the contacts of the controlling switch.

The carburetor Hout chamber 1 may be of any of' the usual .constructions and has wrapped thereabout the heating unit. This Patented Feb. 21, 1922.

A.Appiaauaai ma reentry 1a, leal. semi mi. 446,207.

heatin unit comprises a heating element forme of a air of mica strips 2 and 3 which ma i desired, be integrally joined at 4 to ai in maintainin the proper spacing between the strips. bout these strips is wound a lat resistance band 5 which may,

for example,l be of nichrome or similar resistance material. As illustrated in Fig. 3, this resistance stri ma be wound con'tinuously from one en of t e strip 2 aroundthe mica to the other end of the strip 3. This heating element is enclosed between a pair of mica sheets 6 and 7 to insure proper insulation and rotection of the' resistance element. This eating element is positioned between 'a strip of relatively thick 'fabric 8, which preferably is non-combustible and ab- 'sorbent and lies next to the float chamber- 1, and a strip of fiber paper 9. Outside of this fiber aper 9, a strip of asbestos 10 is positioned. The entire ieating unit is protected by an outer casing 11 of tin or other flexible thin metal which is conformed to the Icontour of the float chamber and ma be provided with upper flanges 12-to aid in retaining the heating unit in place. It is clamped around the vfloat chamber lily buckle 13 formed upon one 'projecting strap member integral with the casing 11 and col opgfating with the slotted strap member 14 a formed integral withthe casing 11.

Tn' this manner the heating unit-'may be readil placed about theiloat chamber and locke in position with a minimum expenditure of eii'ort and in a very short space of time. The absorbent insulator 8 which is in contact with the float chambenwill absorb any moisture due to the sweating of the carburetor and will prevent such' moisture from reachin euch provided with a shank 18 w iich ex. tends through thetin casing and the suzcesf i 'sive layers und contacts -with the resistance l element.

It'. is".protccted by insulatiu flanged bushing members 19 in lthe usua manner. 4

'The switch forcpntrolling the operation means of a the electrical resistance elements... When, owever, his insulator becomes heatwie@ l of the heatiii unit comprises a-base upon the binding post 15. The current new passes 65 which a. meta lic arm 21 is pivotally secured at 22. T Tliisv b'as'e also 'carries a pair. of.

ordinary s'prn contacts 23 and 24 adapted tocontact'wit A third contact, indicated generally at 25, is carried by the 'base This contact, as may he seen fromreference to Fig. 5, comprises an upper s ring arm 26 and a lower spring arm 27 hel in separated and insulated rela- -f 32 and has its outgoing head-33 connected l ground back to' the battery. In this .man-.1

lieat 'with the pivot point 22 of the switch. When the switci is in starting position, which would correspond. to the right hand dotted -line osition, this-lead is connected by the meta ic arm 21, the contact 24, the wire 34. to the binding post 17 which is located centrally of the resistance elcment. The

current now passes from the battery through.

the lower half of the resistance element (see Fig. 3) to the contact 16 along the wire 35' to the ground 36. A second circuit is simultaneously established and is as follows. .From the battery 30, through .the lead 33, arm 21,`contact V24, conductor 34, contact 17 through the upper half of the resistance element to the binding post 15 along the wire 37, the wire 38 to the lower spring arm 27, of the contact 25, through' .the conducting sleeve 29 to the upper spring arm 26, along the condu'ctori) to'the ground 40.

It will be seen that -when theswitch ari'ii is swung to the right,.the upper and lower resistancaelementsare connec din parallel and that the current from the batterypasses to the central binding post. 17 and there divides, passing through each of the halves of the resistance element and through 'the ner, a relatively large generation p may be secured whenever it is desire articularly when starting and in cold weat er.

When the motor has started and it is=dei s'ired to use this heating element in running;

position, the switch'arm y21 is thrown to the left as indicated in-dotted lines.` Ihis dsconnectslthe upper and lower spring arms 26 and 2T and opens 'the ground connection;l

for the upper resistance element. The bat` tery is now connected through the leadl 33,

switch arm 21, contact 28, conductor 38 to the'metallic .rod 21 whenl 'itis swung to' opposite ends lof its stroke.

through the resistance element to the binding post' 16, throughI the conductor 35 to the ground 36.

It will be seen means connects the resistance elements in series. It is of course to be understood that the switch arm 21 may occupy a neutral position as indicated in full lines in Figure 1 thereby opening any circuit connecting the battery with the heating element.

It will thus be seen that a series-parallel control of the heating element is provided and that at all times allof the heat gen erated is effective as none is wasted .in auxiliary controlling resistances. It will also *bev seen that excellent thermal insulation is provided and that mechanical protection is afforded by the encasing tin inembcixll.

We claim:

1.`An electrical heater for a carburetor comprising a. heatin element, means for positioning said heating element upon said carburetor and means for connecting said heating element to var the amount of energy consumed by sai element by varying the effective resistance of said heating element. l

2. An electrical heater for a carburetor comprising a heating unit composed of a mica strip and a resistance member carried thereby, heat .resisting means. positioned upon opposite sides of said element, a pi-"otecting sheathing enclosing said resistance element land heat resisting means and adapted to engage a portion of the carbure` tor to position the heating element and heat resisting. means thereon.

. 3. In combination, a carburetor, an eloctrical heater therefor and an electrical system connected with said heater whereby porthat this last arranged tions of said heater may be connected in series or in parallel to vary the amount of energy consumed by said heater whereby the overa l eiiiciency is iiot decreased.

.4. As an article ofv manufacture,-a flexible heating unit adapted'to be wrapped about a fuel feeding element of an internal combustion engine, said iiexibleliea'tiiig' unit having an inwardly projectingl flange adapted to seat upon sai( fuel feeding element. L

trical heater thereon and including heating elements' having a .pluralit trial switch, and conductors connecting said switch and said heating elements, said switch and conductors being adapted to .permit ALBERT G. KOCH. LOUIS c. rmToW.

5. In combination, a carburetor, an el'ec" l of members. .-adapted for connecting coni uctors', an elec-f 

